book Maths Puzzle Numerical Ability

find the opposite of 4/11. express yor answer as a common fraction?

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Hi
I have this hw due tomorrow. I really need the solution to this problem ASAP.
Thanks

Question:

let x,y belonging to Rm be fixed vectors. COnsider the
function
f(theta)
Please, Calculate the equation of the linear function which contains the ordered pairs (-4,1) and (3,6).